Question

Question 11 Write five pairs of prime numbers less than 20 whose sum is divisible by 5. (Hint: 3 + 7 = 10)

Class 6 - Math - Playing with Numbers Page 54

Answer 1

1st pair is : 2 & 3 (2+3=5)
2nd pair is : 13 & 7 (13+7=20)
3rd pair is : 17 & 3 (17+3=20)
4th pair is : 9 & 1 (9+1=10)
5th pair is : 7 & 3 (7+3=10)

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Answer 2

The answers are (2,3),(3,7),(3,17),(13,17),(11,19)